Switching mechanism and circuit therefor



y 1942' J. BOYSEN ET AL SWITCHING MECHANISM AND CIRCUIT THEREFOR Filed Dec. 29, 1939" lnvenlor JOHANNES BOYSEN & ERNST HORN Patented May 12, 1942 SWITCHING MECHANISM AND CIRCUIT THEREFOR Johannes Boysen, DusseldorL and Ernst Horn, Berlin-Friedenau, Germany, assignors to Fides Gesellschatt fiir die Verwaltung und Verwertnng von gewerblichen Schutzrechten in beschrankter Battling, Berlin, Germany, a corporation of Germany Application December 29, 1939, Serial No. 311,436

. In Germany November 5, 1938 Claims.

The present invention relates to a circuit arrangement for the step-by-step control of motordriven mechanisms, for the operation of selectors.

Selectors of this type are set for example by numerical impulses transmitted by the subscriber. The invention is concerned with a motor driven selector of the well known construction, such as shown in United States Patents 1,978,700, granted October 30, 1934, and 2,002,546, granted May 28, 1935, wherein two field magnets MI and M2 the same as magnets l4 and ii of the first patent or I and 2 of the second patent are alternatively caused to operate and to rotate an armature which controls over cam contacts the circuits of the field mangets.

When such a motor selector is to make single steps by the opening of one or other of the looking circuits, which extend for the time being, over its two energising coils, and maintaining the other energising coil energised, the contact which controls these circuits must eifect the closing as well as the alternating interrupting of the locking circuits. This contact is therefore to be dependent, for example, only on the beginning of the impulse and is not to. be operative at each operation and release the impulse receivingrelay; that is to say, two operations must be brought about by one.

In the present case the problem underlying the invention has been solved, in that a relay, controlling locking circuits which extend over the two energising coils of the motor, is mechanically so arranged that, dependent on control im-.

pulses received, it moves the contact which controls the locking windings of the motor, alternately into its operative or normal position.

The main feature of the invention, therefore, is the provision of a pair of mechanically related relays, one of which has a mechanical device which determines which of a pair of contacts of the first relay will be operated by the energization of said first relay.

The drawing illustrates in Figures 1, 1a, 1b, 1c, 2, 2a, and 2b, various embodiments of the invention. v i

Figs. 1, 1b and 1c illustrate diagrammatically a specially constructed relay I in diiferent views and positions. This relay is of the usual construction having a heel piece 2 to which is screwed the coil l. The sets of springs 8 and I0 are mounted side by side on the heel piece 2 by the usual insulators with the free ends controlled as shown. The armature 2 of this relay is provided with openings 4 adapted to be covered by a spring yoke 5 carried by the armature of another relay, not shown'. In the normal position of this relay the spring yoke 5 covers the upper hole 4 of the armature 3, whereas in the operative position the lower hole 4 is covered, as shown by dotted lines in Fig. 1c. According to which one of the two holes is covered either the operating contact Ila shown in Figure 1b, or the back contact I2a of Figure 1 are actuated. The resilient spring yoke 5, therefore, renders either the projection l of Figure 1, or the projection l4 of the Figure l'b operative. I

In Figures 1 and lb the resilient spring yoke 5 is shown in section. The Figure lb is a section along line A-A of the lower Figure 10, whereas the upper Figure 1 is a section along the line 3-3 with the member 5 being in the position 50f the lower Figure 1c. The magnet of the relay is designated by the numeral l. The armature 3 which 'is carried by the yoke 2 is provided with the holes 4 through which the projections I and I4 extend or do not extend depending on the position of the spring member 6 of the other relay. When the spring yoke is below the one or the other pro- -jection the contacts Na and I2a, respectively,

are actuated. Contact Ha is an operating conings of the motor such as shown, for instance,

in Fig. 1 of patent No. 2,002,546. The contacts ml and m2 are cam contacts whiehare controlled by the shaft of the rotor in the manner shown injhe above patents so that ml is opened and m2 is closed when MI is energized alone, and ml is closed and m2 is opened when M2 is energized alone. Only the step-by-step control of the armature by means of. the above described mechanically interdependent relays is to be explained here.

When a single impulse reaches relay A the hole 4 of the section A-A will be covered, as the relay H is at rest and the spring member 5 in the position shown in Fig; 1. Relay A has an addiates its armature and thereby its contacts, the

spring yoke attached to the armature remains clamped below the projection H of the contact springs in (Fig. lb) so that it can not yet move into the position 6. By the operation of the auxiliary relay H contact l5h is opened and contact I671. closed. Together with relay Aa relay V has operated which is slow-acting and is held energised in known manner under control of relay A during a train of impulses. The circuits of relays A and V are the usual line and release relay circuits. Earth is therefore applied over I411 to both energising coils MI and M2 of the motor, even prior to the opening of contact l5h, over: 14v, cam' contact mi, winding'Ml, battery, or over l4v, I5h, winding M2, battery. As both coils are energized, the motor is held without movement. Now, when contact l5h is opened and contact "in is closed, the circuit for the motor winding M2 is opened, so that the winding Mi may cause the motor to rotate. By the closing 01 m2 current is again supplied to the winding M2 so that'now both coils are conducting j current. By the opening of contact ml the circuit of MI had not been interrupted, as contact IGh is still closed, as stated. The motor has hereby made one step controlled by the first setting impulse.

With the release of relay A after the first impulse contact Ha opens, whereas I2a' remains closed and relay H is held energised in the following circuit: earth, battery, winding II of relay H, contacts in, Nb, earth.

Before the second impulse reaches the impulse receiving relay A, the spring yoke 5 of relay H has moved into the position 6, having been released by projection M at the release of relay A after the first impulse. If new the relay A is energised by the second impulse, the back contact In (Fig. l) is opened, as the yoke spring 5 is in position 6 (Fig. 10). Contact l2a in the locking circuit of winding II of relay H is therefore opened, whereby the relay H releases. tact Ila can now not be closed, as the yoke is Conclamped below the projection 1 (upper figure of Fig, l) With the release of relay H, contact 16h is opened and contact l5h is closed, whereby one step of the motor is performed as described with reference to the first impulse, it being now the energising coil M2 which becomes operative. In order that the rotor may completely attract, winding M2 -is first energised over contact l5h and winding MI is then deenergized to allow M2 to operate the motor and is then reenergized over the cam contact ml when the motor rotates,

'so that the motor is locked. When the relay A releases after the second impulse also, the spring 5 is released again and returned into its normal position. If further impulses reach the relay, the operations described are repeated.

, From this circuit arrangement it follows that two operations are brought about by one in this manner, that is to say that the relay H operates and releases alternately, when the relay A operates.

In Figs. 2 and 2b a relay is shown which, when energised, actuates the contact springs 2|. At the release of the relay the closed or opened contacts remain in their actuated position. Only at means of a step-by-step control.

the second operation of the relay are the contacts restored again. This result is obtained by the armature I8 of the relay being provided with a thrust pawl l9 acting upon a ratchet wheel upon the shaft of which a specially shaped control cylinder for the contacts is arranged. The ratchet wheel is not shown in the drawing. The relay may be provided with a plin'ality of these contacts, and these contacts may also be so operated, that the one is closed when the other is opened. Moreover, the relay may also be provided with normally actuated contacts. How such a construction might be used will be disclosed hereafter with reference to the detailed explanatiorrof Fig. 2a. The coil of the relay is designated by H, 22 being the support 01' the four-conductor control cylinder.

In Fig. 2a a motor selector circuit arrangement is shown in a simplified form. According to this arrangement a control for group-stepping as well as a step-by-step control is possible.

Here again M I and M2 designate the windings of the motor. e contacts ml and m2 are, just as in Fig. 1a, the cam contacts actuated by the motor shaft. The relay A is the impulse receiving relay which may be connected to the telephone line in the usual manner'and the relay H is the specially constructed relay illustrated in Figs. 2 and 217. Here again the slow-acting relay V which is held energised in known manner during a train of impulses is shown controlled by contacts 33a of relay A. The u-contacts shown are contacts of a switching relay U which changes over from the group setting to the step-by-step control of the selector. The wiper d represents a rotary wiper operated by the motor M. The switching operations are as follows: I

When the relay A is energized by an impulse at the operation of the selector, which, for example, is used 'as group selector, the relay V operates, closing its contact 202), whereas contact 3H2 is opened. After the closing of 2012 earth is connected to the winding M! of the motor over 2012 and cam contact mi. As the winding M2 is deenergized, the selector takes one step moving wiper d to its first contact. This first step is limited by the fact that after this step a bridge is completed over contact 35a, wiper d of the selector (the other wipers of the selectors are, for thesake of simplicity, not shown) position rl, operated contact 3671.. Both coils are, therefore, connected to current. The relay H is energized by the closing of contact 32a of the impulse receiving relay. For the selector, three groups of contacts are indicated as accessible to wiper d and the provisional marking is such" that in group I a line is to be reached by If the relay A releases after the first impulse, the relay H releases also by the opening of contact 32a. In view of the special construction of the relay H which, as stated, correspondsto the relay ll of Fig. 2, the contact 35h remains closed (see also Fig. 2b). If now a second impulse is transmitted to the relay A, so that a line of the second group isto be reached, relay A operates again and, thus, also the relay H (the relay V is still held energised as described). The relay H now opens its contact 38b. and closes the contact 35h. The operation of contacts 22h and 2372. is, at present, without effect, as the contactliu is open during the group setting. By the opening of contact 36h the locking bridge is interrupted and the selector starts again, controlled bythe contacts ml and m2 actuated by the rotor shaft. When 36h opens coil Ml energizes to rotate the wiper :1 one step to thereby open ml and close m2, then M2 energizes to rotate the wipers a second step and open 111.! and close ml, etc. The running of the selector 5 is limited by the bridge described before being again completed over position r2 0! wiper d and the closed contact 35h. The selector is now asso-v ciated with the second group. At the end ofthe second impulse the relay H is caused to restore by the opening of contact 32a. The rest contact 35h remains in its closed position. If now a third impulse should reach A, the selector operates again as described with reference to the first impulse.

Suppose now that the selector is to hunt a line within the second group in dependence on a further train of impulses. In order that the manner of operation be always the same, it must always be started from the same zero position of relay H. After the first train of numerical impulses the contact 2| is, in the case described, in'such a zero position (Fig. 2). is an odd one, this contact is in the operated position illustrated in Fig. 2b below. In this case the relay H" receives an impulse when the relay V' releases and the contact 30h is closed (this contact is not shown in Fig. 2; it is closed in the position of the relay shown in the picture Fig. 2b) so that also in this case the starting position exists prior to the arrival of the second train of impulses.

The step-by-step control operates in the following manner: After the release oi relay V, the,

switching relay U operates inknown manner to start the automatic rotary movement when key K is operated. Contact am is closed and contact 35a is opened. If new the first impulse of the second train'of impulses reaches the relay A, relay -H' operates again, closing its contact 36h. Moreover, contact 2272. is opened, and contact 28h closed. As contact 201: is likewise closed, the following circuit for the winding Ml of the motor is completed: earth, battery, MI, contacts 23h, 2lu, 201?, earth. Parallel with the contacts 23h andjlu, cam contact ml is closed. The coil Ml rotates the motor armature by one step, whereupon the cam contact m2 is closed and ml 'is opened. As the winding MI is still ergized, over contact 23h, and m! is now she the motor is stopped after this first step. At the release of relay A after the first impulse the relay H releases, the contacts 23h and 22);, however.

,remain in position, on account of the special energised. In this manner the selector is piloted to the connection to be reached. After termination of the train of impulses relay V releases us again, cutting out the motor over contact Ilv.

If the group selected- By means of the specially constructed relay which may also be constructed in a mechanically. different manner, a positive group and step-bystep control for the selector is obtained. This relay may also be provided in addition to the contacts 2| (Fig. 2) with further,-normally operated contacts. As stated, it'is moreover possible to combine the relays A and H to one single relay by imparting to the normal contacts of this auxiliary relay the functions of the contacts of relay A, which are necessary for a complete circuit arrangement.

We claim: V 1. An arrangement "for controlling the operalli tion of a pair of operating coils, comprising a relay responsive to incoming impulses, a second relay controlled by the first relay, locking circuits for said coils controlled by said second relay, a pair of sets of contacts operated by the first relay, and a member controlled by said second relay for causing the selective actuation of the'contacts of the first relay when said relay responds to impulses.

2. In an impulse responsive device for control- '25 ling a pair of circuits, an impulse receiving re- .chanical member controlled by the second relay A i moved from one position to another by the energization and deenergization thereof. said member in one position rendering one pair of the con-. tacts of the impulse receiving relay effective when that relay is energized, and in another position rendering another pair of the contacts of the impulse receiving relay eflective.

3. An arrangement for controlling a pair of energizing coils, comprising an impulse receiving relay, said relay operated in response to received impulses to control the operation of the 40 coils, a second relay controlled thereby to --,cause the operation of the proper ones or said coils, said second relay energized and dee'nergized under direct control of said impulse receiving relay, said second relay cooperating with said impulse receiving relay to cause the first energization of the 3 wherein one of said relays has one contact set controlled on its first energization and another set controlled on its second energlzation whereby successive energizations of said relay control alternate ones oi said sets.

5. In a circuit arrangement ior controlling a I motor having a pair of operating magnets, a line relay responsive to received impulses, an auxiliary relay controlled by said line relay for causing locking operation of said magnets, a first operation of said auxiliary relay causing the operation of one of said magnets and the second operation thereof causing the operation of said other magnet.

JOHANNES BOYSEN. ERNST HORN. 

